Chainsaw Repair

took some time to get some realistic numbers.  thing is, there is not enough material there to widen the intake manifold out enough.  the manifold is made of what looks like bakelite, has 6 panhead bolts holding it onto the cylinder, along with two carb bolts.  the pulse port on the manifold feeds the carb, and is located very close to the perimeter of the stock hole.

so, the stock manifold hole can only be brought out to 0.820" diameter.  this yields an maximum x-sectional area of 0.528 in2.  that is the maximum area value, i will be using for my port mouth opening at the cylinder.

what all this means, is by using the porting program set to a max area value of 0.528 in2, looks like the most i can raise the power band is only 430 rpm while keeping the rest of the ports all balanced.

the following screenshot shows what the rpm ranges/case res rpm/pulse tuning sweet spots morphed into using the design programs formulas.